Stapler



FIG. 1 is a top plan view of a stapler showing my new design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is the right side elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a front elevational view thereof; and

FIG. 6 is a rear elevational view thereof.

The ornamental design for a stapler, as shown and described.